Process of manufacturing hydrate of calcium peroxid.



no. eats.

UNITED STATES Patented J i, H563;

PROCESS OF MANUFACTURING HYDRATE OF CALCIUM PEROXID.

SPECIFICATION forming part of Letters Patent No. 733,047, dated July 7, 1903.

Original application filed December 27, 1900, Serial No. 41,249. Divided and this application filed April 13, 1908. derial No. 152,398. (No specimens.)

To all whom it may concern: I

Be it known that I, GEORGE FRANQOIS J AU- BERT, a citizen of the Republic of Switzerland, but now residing at Paris, France, have invented certain new and useful Improvements in the Manufacture of H ydrates of the Alkaline-Earths and other Dioxids and in Their Application to Bleaching, of which the fol- I lowing is a specification.

v cate; but these hydrates,

of calcium,

My invention relates to the manufacture of hydrates of the alkaline-earth and other dioxide and in their application to bleaching, and the present application for a patent is a division of the application filed by me under date off-December 27, A. D. 1900, and serially numbered 41,249.

I have discovered that hydrates of sodium dioxid may be advantageously employed in' the preparation by a double decomposition of the hydrates of the alkaline-earth and What is meant by hydrate of bioxid of sodium is the bodies corresponding to the formula Na O +2 to 10H O.

Hitherto the hydrates of the alkaline-earth dioxids have only been prepared by the action of natural oxygen'ized Water upon a solution of corresponding alkaline-earth hydrates. The hydrates of bioxids of lime, baryta, strontia have for formulae and more stable oxygenized water by removing the metal in an insoluble form-for example, as a sulfate, phosphate, or fluosiliparticularly those have not been industrially manufactured.

I have discovered that the hydrate of sodium dioxid in the presence of alkaline-earth hydrates gives off its oxygen to them in the same manner as oxygenized water, causing formation of hydrates of the alkaline-earth peroxids and caustic soda. I have also found that by replacing solutions of alkaline-earth hydrates necessarily very poor in oxygen hitherto alone employed for the preparation of the hydrates of the peroxids by the alkaeconomical results in that more concentrated caustic soda is recuperated. I have found that I arrive at the same result by replacing the alkaline-earth hydrates with soluble salts-such as the chlorids, oxychloridls, su crates, and the like. I may mention as an example the preparation of the hydrate of calcium dioxid by the aid of milk of lime. The lime I employ is in a solid state in suspension in water and although not dissolved I transform it entirely, so as to secure a return of ninety-seven per cent. of peroxid of lime in an amorphous condition less hydrated and which can be dried without appreciable decomposition and can therefore be utilized in the industries. Furthermore, by reason of the employment of the solid. lime in suspension in Water I am able to reinforce the solution of concentrated caustic soda, having much value due to the concentration by test reaching ten per cent. The milk of lime obtained from fifty six kilograms of quicklime is mixed with a solution of hydrate of sodium dioxid corresponding to seventyeight kilograms of actual sodium dioxid in one thousand liters of cold water and the mixture stirred as long as the presence of appreciable quantities of hydrate of sodium dioxid in solution can be detected. When the action is ended, the solution of caustic soda is filtered 01f, the hydrate of calcium dioxid collected, washed with water, and dried.

The hydrates of the alkaline-earth peroxids and especially the hydrate of calcium dioxid may be employed With advantage for bleaching Wool, feathers, and other matter and for oxidizing processes in general.

Having thus describedthe nature and object of my invention, what I claim as new, and desire to secure by Letters Patent, is-

The process of manufacturing hydrate of calcium peroxid, which consists in treating milk of lime with a solution of hydrate of so dium dioxid, agitating during presence of any appreciabie amount of hydrate of somy signature in the presence oftwc snhscrihdium dioxid in the solution, then filtering the ing witnesses.

hydrate of sodium dioxid collected, then 1 5 washing with water and finally drying the GEORGE FRANCOIS JAUBERT' 5 same, substantially as a described.

In testimony whereof I have hereunto set nd for the purposes Witnesses: Y PAUL DE, MESTRAL,

AUGUSTUS E. INGRAM. 

